CN103748760B - Receiver Electrodes for Capacitive Wireless Powering Systems - Google Patents

Abstract

Various receiver electrodes for supplying power to a load connected in a capacitive power transfer system are disclosed. In one embodiment, the receiver electrode comprises: a first conductive plate (212) connected to a first spherical hinge (211), wherein the first spherical hinge is coupled to a first receiver electrode (210); and a second conductive plate (222) connected to a second spherical hinge (221), wherein the second spherical hinge is coupled to a second receiver electrode (220) connected to an inductor of the capacitive power transfer system and the first receiver electrode is connected to the load, the inductor being connected to the load thereby resonating the capacitive power transfer system.

Description

Receiver Electrodes for Capacitive Wireless Powering Systems

This application claims U.S. Provisional Application No. 61/523,936, filed August 16, 2011, U.S. Provisional Application No. 61/523,960, filed August 16, 2011, U.S. Provisional Application No. 61/611,687, filed March 16, 2012 and priority to U.S. Provisional Application No. 61/640,896, filed May 1, 2012.

technical field

The present invention relates generally to capacitive powering systems for wireless power transfer, and more particularly to receiver electrode structures for transferring power over a large area.

Background technique

Wireless power transfer refers to power supply without any wire or contact, whereby power supply of electronic devices is performed through a wireless medium. One popular application for contactless power supply is the charging of portable electronic devices (eg, mobile phones, laptop computers, etc.).

One implementation for wireless power transfer is through inductive powering systems. In such systems, electromagnetic induction between a power source (transmitter) and a device (receiver) allows contactless power transfer. Both the transmitter and receiver are equipped with electrical coils, and when they are in physical proximity, an electrical signal flows from the transmitter to the receiver.

In inductive power supply systems, the generated magnetic field is concentrated inside the coil. Therefore, the power delivered to the receiver pickup field is very spatially concentrated. This phenomenon creates hot spots in the system that limit system efficiency. In order to improve power transfer efficiency, a high quality factor for each coil is required. For this purpose, the coil should be characterized by an optimal ratio of inductance to resistance, constructed of a material with low resistance and fabricated using a Litz wire process to reduce skin effect. Additionally, the coil should be designed to conform to complex geometries to avoid eddy currents. Therefore, expensive coils are required to obtain an efficient inductive power supply system. The design of a contactless power transfer system for large areas would necessitate many expensive coils, so for these applications inductive powering systems may not be feasible.

Capacitive coupling is another technique used to transfer power wirelessly. This technique is mainly used in data transfer and sensing applications. A car radio antenna glued to a window with a pick-up element inside the car is an example of capacitive coupling. Capacitive coupling technology is also used for contactless charging of electronic devices. For these applications, charging units implementing capacitive coupling operate at frequencies other than the natural resonance frequency of the device.

Capacitive power transfer systems can also be used to transfer power over large areas such as windows, walls with flat structures, and the like. An example for such a capacitive power transfer system 100 is depicted in FIG. 1 . A typical arrangement for such a system includes a pair of receiver electrodes 111 , 112 connected to a load 120 and an inductor 130 as shown in FIG. 1 . System 100 also includes a pair of transmitter electrodes 141 and 142 connected to power driver 150 , and insulating layer 160 .

The transmitter electrodes 141 , 142 are coupled to one side of the insulating layer 160 and the receiver electrodes 111 , 112 are coupled from the other side of the insulating layer 160 . This arrangement forms a capacitive impedance between the pair of transmitter electrodes 141 , 142 and receiver electrodes 111 , 112 . Accordingly, a power signal generated by the power driver may be wirelessly transmitted from the transmitter electrodes 141 , 142 to the receiver electrodes 111 , 112 to power the load 120 . System efficiency increases when the frequency of the power signal matches the series resonant frequency of the system. The series resonant frequency of system 100 is the inductance value of inductor 130 and/or inductor 131 and the capacitive impedance between the pair of transmitter electrodes 141, 142 and receiver electrodes 111, 112 (C1 and C2 in FIG. 1 ) The function. The load may be, for example, an LED, a string of LEDs, a lamp, or the like. As an example, system 100 may be used to power a lighting fixture mounted on a wall.

The capacitive impedance (C1 and C2) is a function of the distance between the receiver electrodes and the transmitter electrodes. The capacitance value should be calculated as follows:

where A is the area of the receiver electrodes (shown as S1 and S2 in FIG. 1 ), d is the thickness of the insulating layer 160 , and ε is the dielectric value of the dielectric.

The distance between the receiver and transmitter electrodes and thus the capacitive impedance may vary, or may not be constant, for example, when the surface of the insulating layer and/or the transmitter electrode is non-uniform (e.g., across a variable thickness of the insulating layer , bent, loose or deformable electrodes). In capacitive wireless system 100 , power is efficiently wirelessly transferred from driver 150 to load 120 when the frequency of the power signal substantially matches the series resonant frequency of system 100 . Therefore, fluctuations in the capacitive impedance will cause the current flowing through the load 120 to fluctuate.

Therefore, it would be advantageous to configure the receiver electrodes to be aligned with the transmitter electrodes to ensure efficient power transfer in capacitive power systems.

Contents of the invention

Some embodiments disclosed herein include articles of manufacture for supplying power to a load connected in a capacitive power transfer system. The article comprises: a first conductive plate (212) connected to a first ball hinge (211), wherein the first ball hinge is coupled to a first receiver electrode (210); and connected to a second ball hinge (221) The second conductive plate (222) of , wherein the first spherical hinge is coupled to the second receiver electrode (220), the second receiver electrode is connected to the inductor of the capacitive power transfer system and the first receiver electrode is connected to A load, an inductor is coupled to the load to resonate the capacitive power transfer system.

Some embodiments disclosed herein also include articles of manufacture for supplying power to a load connected in a capacitive power transfer system. The article comprises: a flexible pocket (330); a first receiver electrode (310) connected to the flexible pocket and to a load; and a second receiver electrode connected to the flexible pocket and to an inductor of a capacitive power transfer system ( 320 ), the inductor is connected to the load to resonate the capacitive power transfer system.

Some embodiments disclosed herein also include a magnetic mount 900 for mechanically securing the receiver to the transmitter of the capacitive power transfer system. The magnetic mount includes: a first set of a plurality of transmitter electrodes (910-1, 910-r) comprising a plurality of permanent magnets having a first magnetic pole orientation, each of the first plurality of transmitter electrodes the transmitter electrodes have a first electrical potential; a second set of a plurality of transmitter electrodes (920-1,920-r) comprising permanent magnets having a second magnetic pole orientation opposite the first magnetic pole orientation, wherein the second set of multiple Each of the transmitter electrodes has a potential opposite to that of each of the plurality of transmitter electrodes; a first receiver electrode having a first potential and comprising a permanent magnet having a first pole orientation; and a second receiver electrode having a second potential and comprising a permanent magnet having a second pole orientation; wherein the first receiver electrode is oriented with respect to one transmitter electrode of the plurality of transmitter electrodes of the first set, and the second receiver electrode The transmitter electrodes are oriented with respect to one transmitter electrode of the second plurality of transmitter electrodes, and the receiver is mechanically secured to the transmitter to allow a power signal to be wirelessly transmitted from the transmitter to a load connected to the receiver.

Description of drawings

The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The above and other features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Figure 1 is a diagram of a capacitive power system.

Figure 2 is an illustration of an arrangement of receiver electrodes constructed in accordance with one embodiment.

3A and 3B are illustrations of receiver electrodes configured as part of a flexible pouch, according to one embodiment.

4A and 4B are illustrations of receiver electrodes configured as part of a flexible pouch according to one embodiment.

Figure 5 is a picture illustrating a practical application of the flexible pocket receiver.

6, 7, 8 and 9 are diagrams of various magnetic fixtures constructed in accordance with various embodiments.

detailed description

It is important to note that the disclosed embodiments are only examples of the many advantageous uses of the novel teachings herein. In general, statements made in the specification of the present application do not necessarily limit any of the respective claimed inventions. Furthermore, some statements may apply to some inventive features but not to others. In general, unless indicated otherwise, a single element may be multiple and vice versa without loss of generality. In the figures, like numbers refer to like parts throughout the several figures.

Figure 2 shows a schematic diagram of a pair of receiver electrodes 210 and 220 constructed in accordance with one embodiment of the invention. Receiver electrodes 210 and 220 are part of capacitive powering system 200 that operates as described in detail herein. System 200 includes a power driver 201 connected to a pair of transmitter electrodes 202 and 203 covered by an insulating layer 204 . The connection may be a galvanic or capacitive coupling connection. On the receiver side, receiver electrodes 210 and 220 are connected to load 205 and inductor 206, respectively.

As depicted in FIG. 2, insulating layer 204 is a thin layer having a curved shape. The insulating layer 204 may be any insulating material including, for example, paper, wood, textiles, glass, deionized water, and the like. In one embodiment, the material is selected to have a dielectric constant. The thickness of the insulating layer 204 is typically between 10 micrometers (eg, paint layer) and several millimeters (eg, glass layer). The transmitter electrodes 202 , 203 also have a curved shape to conform to the structure of the insulating layer 204 . The transmitter electrodes 202, 203 may be any conductive material such as carbon, aluminum, indium tin oxide (ITO), organic material such as poly(3,4-ethylenedioxythiophene) (PEDOT), copper, silver, conductive paint or any conductive material.

To allow for efficient power transfer, the surface area of the transmitter electrodes substantially overlaps the surface area of the receiver electrodes, allowing a constant distance between the electrodes, thereby eliminating any fluctuations in capacitive impedance and current flow through the load 205 .

According to this embodiment, the receiver electrodes 210 , 220 are shaped in such a way as to overlap the surface area of the transmitter electrodes 202 , 203 . For this purpose, each of the receiver electrodes 210, 220 comprises a conductive plate 212, 222 connected to a ball hinge 211, 221 also made of conductive material.

The conductive plates 212, 222 and ball hinges 211, 221 may be the same conductive material as the transmitter electrodes or be made of a different conductive material. Such materials may include, for example, carbon, aluminum, indium tin oxide (ITO), organic materials, conductive polymers, PEDOT, copper, silver, conductive paint, or any conductive material.

The structure of the receiver electrodes allows free movement of the conductive plates 212, 222 along the horizontal axis. Thus, anywhere along the insulating layer 204, the conductive plate substantially overlaps the surface area of the transmitter electrodes 202,203. In addition, this structure advantageously provides a substantially uniform gap between the transmitter and receiver electrodes, thereby reducing the possibility of large gaps between the transmitter and receiver electrodes, thereby substantially ensuring that capacitance is formed between them.

In one embodiment, the ball hinges 211, 221 are implemented as mechanical springs allowing the movement of the conductive plates 212, 222 in horizontal and vertical directions.

In another embodiment, the receiver electrodes are connected to a fixture 230 to securely fix the receiver device (including electrodes 210, 220, load 205 and inductor 206) to infrastructure (eg, wall, window, etc.). The fixing means 230 may include, for example, permanent magnets, suction caps, glue layers, and buckle straps, among others. Various embodiments of magnetic anchors are discussed below. When glue is used as the fixing means, the glue layer serves as the insulating layer 204 .

Another embodiment for configuring the receiver electrodes to adapt easily and seamlessly to the surface shape of the infrastructure (insulation layer and transmitter electrodes) is shown in Figures 3A and 3B. According to this embodiment, the receiver electrodes 310 , 320 are fixed on the outer surface of the flexible pocket 330 . Flexible bag 330 may be any flexible container that encloses a gas or liquid volume, such as an inflatable plastic bag or a balloon. The material of the flexible pocket 330 is a non-conductive material.

The material of the receiver electrodes 310, 320 may comprise any conductive material, such as those mentioned above. The electrodes 310, 320 are connected to a receiver device 340 comprising a load and an inductor (not shown in Figures 3A, 3B) as described in detail above.

To power the load in receiver device 340, the flexible pocket is pressed onto insulating layer 350, as shown in Figure 3B. Thus, the transmitter electrodes 360 , 361 connected to the insulating layer 350 are aligned with the receiver electrodes 310 , 320 . Thus, the load in receiver device 340 is powered wirelessly, as discussed in detail above. The power signal is generated by a driver 370 connected to the transmitter electrodes 360,361.

As depicted in FIGS. 3A and 3B , a plurality of transmitter electrodes are placed along the curved shaped insulating layer 350 . The design of the receiver electrodes 310, 320 provides that when the flexible pocket 330 is pressed onto the insulating layer 350, on each pair of transmitter electrodes 360, 361 the corresponding surface areas substantially overlap.

4A and 4B show another embodiment of receiver electrodes 410 , 420 connected within a flexible pocket 430 . This design may be used when the receiver electrodes 410, 420 are to be isolated from the environment, eg for hygienic reasons. In certain configurations, receiver devices including loads and inductors (not shown in FIGS. 4A and 4B ) may also be placed within flexible pocket 430 . The flexible pocket 430 is made of a non-conductive material. The receiver electrodes 410, 420 may be made using any of the above mentioned conductive materials.

When the receiver and transmitter electrodes are aligned, a capacitive impedance is created between the receiver electrodes 410, 420 and the transmitter electrodes 450, 451. To this end, when the flexible pocket 430 is pressed onto the insulating layer 460, the receiver electrodes are deformed to align with the transmitter electrodes 450, 451, as shown in FIG. 4B. In this position, the load in the receiver device is wirelessly powered, as discussed in detail above. The power signal is generated by a driver 470 connected to the transmitter electrodes 450,451.

Figure 5 shows a practical application of a flexible pouch 500 according to one embodiment. The flexible pouch 500 is an air-filled plastic bag with a pair of receiver electrodes 501 and 502 implemented as two copper strips adhered to the plastic bag. The flexible pocket 500 is a complete receiver device including an LED light (load) 503 and an inductor 504 . The flexible pocket 500 can be any shape (eg, shaped as an action figure) or any color. Accordingly, embodiments of the flexible pocket can be used as night lights, outdoor lighting fixtures, and the like.

In one embodiment, the flexible pouch disclosed herein includes securing means to secure the receiver device to the surface of the insulating layer. Fixing means may include, for example, permanent magnets, suction caps, layers of glue, and the like. In an embodiment of a permanent magnet, the surface of the insulating layer may comprise a soft magnetic material, such as iron or ferrite varnish. The flexible pocket is attracted to the surface by one or more magnets. The magnets can be adhered to the inner or outer layer of the flexible pocket, but are not in direct contact with the receiver electrodes. In a preferred embodiment, the magnets are arranged behind the electrodes in a pocket within the device. The magnets of the flexible pockets can consist of solid blocks or powdered magnetic material mixed in a flexible polymer.

In another embodiment, the flexible pocket is attached to the insulating layer surface using one or more suction caps as a securing means. For this purpose, the surface should be very smooth to allow the suction cap to maintain a vacuum with the surface. The suction cap may be arranged behind the receiver electrodes of the pocket device.

It should be noted that for the embodiments described with reference to Figures 3, 4 and 5, the system is a capacitive power system in which when the frequency of the power signal is substantially matched to that formed between the electrodes and the inductor connected to the load A load (eg, a lamp) is wirelessly powered at a series resonant frequency related to capacitive impedance. Thus, for example, embodiments disclosed herein may be used to power a wall-mounted light without wires or electrical outlets.

For aesthetic reasons, it may be desirable to attach the receiver device to large surfaces such as walls or windows without any mechanical means such as screws and nails. Accordingly, various embodiments disclosed herein include magnetic fixtures for use in capacitive wireless power systems.

In one embodiment shown in Figure 6, the transmitter electrodes 601, 602 are strips made of paramagnetic and conductive material and are connected to infrastructure such as a wall. For example, each of the electrodes 601, 602 may be a sheet of iron metal having a thickness of about 0.5 mm to 1 mm. The receiver device 610 includes a permanent magnet 611 that is attracted to the transmitter electrodes 601 and 602, thereby magnetically securing the receiver device 610 to the infrastructure.

The receiver device 610 further comprises electrodes 612, 613 which are located at close distance from the transmitter electrodes 601, 602 when the magnet 611 is in contact with the transmitter electrodes 601, 602 (but due to the presence of an insulating layer between them without touching each other). In this position, a load 614 connected to an inductor 615 is wirelessly powered, as discussed in detail above. The power signal is generated by a driver (not shown) connected to transmitter electrodes 601 and 602 . Thus, air or the final layer of the wall (for example, wallpaper, foil or lacquer) can be used as insulation. When air is the insulating layer, spacers are used between the transmitter and receiver electrodes to prevent them from galvanic contact. In this embodiment the receiver electrodes 612, 613 are made of a conductive and non-magnetic material such as copper, or of any of the above mentioned organic materials.

In another embodiment, the receiver device comprises at least two magnets. The magnets are covered by a thin conductive layer to form receiver electrodes. The conductive layer can be made of tin foil and adhered to the magnet. Alternatively, the magnets can be covered by a metallic material by a deposition process such as galvanic deposition.

In this embodiment, the receiver electrodes are magnetically attracted to the transmitter electrodes, thereby magnetically securing the receiver device to infrastructure (eg, a wall). The transmitter electrodes can be of any shape that fits behind the trim cover.

Figure 7 is a cross-sectional view of a magnetic fixture according to another embodiment. The transmitter device comprises permanent magnets 703 , 704 mounted on the back of the transmitter electrodes 701 , 702 . Magnet 703 is oriented along a first pole, while magnet 702 is oriented along an opposite pole of first transmitter electrode 702 .

In the receiver device, the first receiver electrode 713 comprises a permanent magnet 711 oriented such that it is attracted by the magnet 703 associated with the first transmitter electrode 701 . That is, the magnetic orientation of magnet 711 is opposite to that of magnet 703 . The second receiver electrode 712 includes a permanent magnet 714 such that it is attracted to the magnet 704 of the second transmitter electrode 702 . Thus, the receiver device can only be secured to the infrastructure when the device is in the correct orientation, thereby ensuring a proper electrical connection. It should be noted that when the receiver device is mechanically fixed to the transmitter device by magnetic force, there is no direct electrical contact between them because the receiver electrodes 712 , 713 are separated from the transmitter electrodes 701 , 702 by the insulating layer 720 . The insulating layer 720 may be air, a paint layer, wallpaper, or the like. "+" and "-" marks in FIG. 7 indicate magnetic orientation.

In another embodiment, the transmitter device includes permanent magnets associated with transmitter electrodes. For example, a transmitter electrode can be placed in front of a permanent magnet. The transmitter electrodes associated with the permanent magnets can have different potentials or phase shifts. As shown in Figure 8, a reference electrode 801 associated with a permanent magnet (not shown) oriented along the first pole is arranged in the center of the circle. Around this reference electrode, a plurality of adjacent transmitter electrodes 802, 803, 804 and 805 are arranged, where each transmitter electrode is connected to a permanent magnet (not shown) oriented along a second magnetic pole (which is opposite to the first magnetic pole). relevant. Each of the adjacent transmitter electrodes 802 to 805 has a different potential compared to the reference electrode 801 . According to this embodiment, the receiver device 810 may then be placed such that one receiver electrode 811 is on the reference transmitter electrode 801 and the other receiver electrode 812 is on one of the adjacent electrodes 802 to 805 . Each of the receiver electrodes 811, 812 may be placed in front of a permanent magnet (not shown in Figure 8).

It should be noted that since each pair of transmitter electrodes has a different potential, the placement of the receiver electrodes relative to the transmitter electrodes determines the amount of power to be transferred. This allows the power level to be adjusted by selecting different potentials. This could be used to dim the light emitted by a lamp in receiver device 810, for example. It should also be noted that when the receiver device 810 is mechanically fixed to the transmitter device 800 by magnetic force, there is no direct electrical contact between them because they are separated by an insulating layer. The "+" and "-" marks in FIG. 8 indicate magnetic orientation.

In another arrangement depicted in FIG. 9, a plurality of first transmitter electrodes 910-1 to 910-r are arranged in a semicircle, and a plurality of second transmitter electrodes 920-1 to 920-r are also arranged Arranged in a semicircle such that the two semicircles combine to form a circle. Each of the electrodes 910-1 to 910-r and 920-1 to 920-r has a different electrical potential such that by adjusting the receiver device 930, different power levels can be selected. Furthermore, the first set of transmitter electrodes 910-1 through 910-r and the second set of transmitter electrodes 920-1 through 920-r are associated with different magnetic poles. "+" and "-" marks in FIG. 9 indicate magnetic orientation.

According to this embodiment, one receiver electrode 931 of the receiver device 930 can then be aligned with one of the first transmitter electrodes 910-1 to 910-r, and a second receiver electrode 932 with the second transmitter electrode 920-1 to 920-r are aligned. In a different exemplary arrangement, receiver and transmitter electrodes with different potentials are arranged in two parallel rows.

Although the invention has been described in considerable detail and with some particularity by reference to a few described embodiments, the invention is not intended to be limited to any such details or embodiments or to any particular embodiment, but instead should be read with reference to the appended claims It is construed so as to provide the broadest possible interpretation of these claims in light of the prior art, and thus effectively encompass the intended scope of the present invention. Additionally, the invention has been described above in terms of embodiments foreseen by the inventor as being available in the authorized description, however, now unforeseen insubstantial modifications of the invention may nonetheless represent equivalents thereof.

Claims (15)

CLAIMS 1. An article for supplying electrical power to a load connected in a capacitive power transfer system comprising: a first conductive plate (212) connected to a first ball hinge (211), wherein the first ball hinge is coupled to the first receiver electrode (210); and A second conductive plate (222) connected to a second ball hinge (221), wherein the second ball hinge is coupled to a second receiver electrode (220), wherein the second receiver electrode is connected in series to the an inductor of a capacitive power transfer system, and the first receiver electrode is connected in series to the load, the inductor being connected in series to the load and configured to be at a series resonant frequency of the capacitive power transfer system Lower resonance; Wherein the first ball hinge (211) is adapted to conduct electricity between the first conductive plate (212) and the first receiver electrode (210), and the second ball hinge (221) is adapted to conduct electricity between the second Conduction is conducted between the plate (222) and the second receiver electrode (220). 2. The article of claim 1, wherein when the frequency of the power signal generated by the power driver is substantially matched to the inductor and capacitance formed between the transmitter electrode pair (202, 203) and the receiver electrode The power signal is wirelessly transmitted from the transmitter electrode pair (202, 203) coupled to the insulating layer (204) to the first and second receiver electrodes at a series resonant frequency of the electrical impedance to provide the load powered by. 3. The article of claim 2, wherein each of the first and second conductive plates substantially overlaps the surface area of one of the transmitter electrode pairs in order to reduce the capacitance Fluctuations in sexual impedance. 4. The article of claim 1, wherein each of the first and second conductive plates, each of the first and second ball hinges, and each of the first and second electrodes Each is made of conductive materials including any of the following materials: carbon, aluminum, indium tin oxide (ITO), poly(3,4-ethylenedioxythiophene) (PEDOT), copper, silver, and conductive paint. 5. An article for supplying electrical power to a load connected in a capacitive power transfer system comprising: flexible pocket (330); a first receiver electrode (310) connected to the flexible pocket and connected in series to the load; and A second receiver electrode (320) connected to the flexible pocket and connected in series to an inductor of the capacitive power transfer system, wherein the inductor is connected in series to the load and configured to Resonance at the series resonance frequency of the power transmission system; Wherein said flexible pocket (330) is adapted to configure the receiver electrodes to adapt seamlessly to the surface shape of the infrastructure containing the transmitter electrode pair. 6. The article of claim 5, wherein when said flexible pocket is adapted to be pressed against and to the shape of the insulating layer (350) such that the receiver electrodes (310, 320) adapted to be aligned with the pair of transmitter electrodes (360,361), the frequency of a power signal generated by a power driver substantially matched to said inductor and a circuit formed between said pair of transmitter electrodes (360,361) and said receiver electrodes The power signal is wirelessly transmitted from the pair of transmitter electrodes coupled to the insulating layer to the first and second receiver electrodes to wirelessly power the load at the series resonant frequency of the capacitive impedance , wherein both the transmitter electrode pair and the insulating layer have a curved shape. 7. The article of claim 6, wherein each of the first and second receiver electrodes substantially overlaps the surface of one of the transmitter electrode pairs so as to reduce the capacitance Fluctuations in sexual impedance. 8. The article of claim 5, wherein the flexible pocket is a flexible container for enclosing any of a gas volume and a liquid volume, wherein the flexible container is made of a non-conductive material. 9. The article of claim 5, wherein the first and second receiver electrodes are adhered to the outside of the flexible pocket. 10. The article of claim 5, wherein the first and second receiver electrodes are adhered to the inside of the flexible pocket (430). 11. The article of claim 6, wherein the flexible pocket further comprises securing means to secure the flexible pocket to the surface of the insulating layer, wherein the flexible means comprises any of the following: a permanent magnet, Suction cover and glue layer. 12. A magnetic fixture (900) for mechanically securing a receiver to a transmitter of a capacitive power transfer system, comprising: A first plurality of transmitter electrodes (910-1, 910-r) comprising a plurality of permanent magnets having a first pole orientation, each transmitter electrode of the first plurality of transmitter electrodes having a first a potential; A second plurality of transmitter electrodes (920-1, 920-r) comprising permanent magnets having a second magnetic pole orientation opposite to the first magnetic pole orientation, wherein the second plurality of transmitter electrodes in the Each transmitter electrode of the first plurality of transmitter electrodes has a potential opposite to the potential of each transmitter electrode of the plurality of transmitter electrodes of the first set; a first receiver electrode having said first electrical potential and comprising a permanent magnet having said first pole orientation, wherein an inductor is connected in series to said first receiver electrode and a load, said inductor being configured to operate at resonate at the series resonant frequency of the capacitive power transfer system; and a second receiver electrode having said second electrical potential and comprising a permanent magnet having said second pole orientation; wherein said first receiver electrode transmits with respect to one of said first plurality of transmitter electrodes and the second receiver electrode is oriented with respect to a transmitter electrode of the second plurality of transmitter electrodes, the receiver being mechanically fixed to the transmitter to allow power signal wirelessly transmitted from the transmitter to the load connected to the first receiver electrode, wherein the first receiver electrode, the inductor, the load and the second receiver electrode are sequentially connected in series connect. 13. The magnetic fixture of claim 12, wherein said receiver is mechanically fixed to said transmitter, said first and second receiver electrodes being connected to said first and second sets of electrodes through an insulating layer. The plurality of transmitter electrodes are electrically isolated. 14. The magnetic fixture of claim 12, wherein the power signal is generated by a power driver included in the transmitter, and when the frequency of the power signal is substantially matched to that of the inductor and formed in The power signal is wirelessly transmitted from the transmitter to the series resonance frequency of the capacitive impedance between the first and second sets of transmitter electrodes and the first and second receiver electrodes the receiver. 15. The magnetic fixture of claim 12, wherein the permanent magnets are covered by a thin conductive layer to form the receiver and transmitter electrodes.